Dempsey b



(No Model.)

D. B.v H-ANSON.

BAND SAW MILL. NO.- 437,490. Y Patented sept. so, 1890.

UNITED ASTATES YPrfrENT OFFICE.

DEMPSEY B. IIANSON, OF MILWAUKEE, WISCONSIN, ASSIGNOR OF ONE-HALF TO IVILLIAM W. ALLIS, OF SAME PLACE.

BAND-SAW MILL.

SPECIFICATION forming part of Letters Patent No. 437,490, dated September 30, 1890.

Application filed July 23, 1889. Serial No. 318,377. (No model.)

.To all whom it may concern:

Be it known that I, DEMPSEY vB.IrIAI\ISO1\T,a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Band-Saw Mills, of which the following is a specification.

My invention relates to band-saw mills; and itconsists in a novel construction and arrangement of the devices for supporting the upper saw-carrying wheel.

In the drawings, Figure lis a side elevation, partly in section, of the supporting'bracket and attendant parts; and Fig. 2, a sectional view taken through the shaft or axis of the upper supporting-wheel.

A indicates the main frame of the machine, and B a U-shaped bracket adapted to slide upon the front face thereof, the said bracket being raised and lowered, as required, by means of a screw C, as shown in Fig. 1, and as is common in this class of mills.

D indicates the saw-carrying wheel, the shaft E of which is supported at its ends in boxes or bearings F, which in turn are pivotally secured to the upper ends of the pedestals G, as shown in Fig. 2. The pedestals G are shouldered near their upper ends, as at a, while below theshoulders they are formed with a stem b, which projects downward through an opening formed in the upper end of the arms of the bracket B, the stem being made to accurately t the opening so as to prevent wabbling or play, but at the same time permit a free up-and-down movement.

Each stem o. is provided with a conical socket c in its lower end, to receive an upright rod H, having at its upper end a conical point d to enter the socket c, and having at its lower end an inverted-V-shaped notch c, as shown in Fig. 1. These rods H H upon opposite ends of a T-shaped lever I comprise two arms f and g, arranged at right angles to each other, the arm f,which I designate as the weight arm, joining the arm g at or about the midlength of the latter.

Arm g is provided at each end on its lower side with knife-edges or fulcrums h h., which rest upon the bottom or base of the bracket B.

On its upper face, slightly in advance of the 5o fulcrums h 7?., the arm g is provided with a second set of` knife -edges or fulcrums il fi, which, as shown, enter the notches e. e in the lower ends of the rods H. y

While I have shown the lever I as provided with a single arm, (to receive the weight,) I do not wish to be understood as limiting myself to this particular construction and arrangement, as it is obvious that a compound system of levers may be used in connection with 6o or as a substitute for that herein shown.

The broad idea of adjusting the bracket bodily with the tension device and the idea of straining or putting thesaw under tension are not claimed herein, as I am aware that mills have been provided with these devices, the present invention being restricted to the construction of the Wheel-supporting devices.

By reference to the drawings it will be seen Vthat the slightest strain upon the saw will be 7o compensated for, the knife-edges or fulcrums h i rendering the tension mechanism extremely sensitive in fact, much more so than any of the devices now in use of which I am aware.. The pivoting of the boXesin the pedestals and the connection between the latter and the upright rods aid materially in securing this sensitiveness, and at the same time permit the parts to freely adjust themselves relatively to each other, as required. The 8c boxes may, however, be rigidly secured tozthe pedestals or the latter made integral with the rods, or the rods made to bear upon and support the bearings without the intervention of the pedestals, so far as the construction and operation of the rod-supports are concerned. Having thus described my invention, what I claim is-` 1. In a band-saw mill, the combination, with the bracket, the saw-wheel, and its shaft, of 9o the boxes or bearings, the pedestals G G, connected to the boxes and provided each with a conical socket in its lowerend, rods H H, pointed at their upper ends and having a V-shaped notch in their lower ends, and 'a weighted 95 lever provided with knife-edges or fulcrums fifi, to support the rods, all substantially as shown.

2.' In a band-Saw mill, the combination, with In witnesses whereof I hereunto sei; my. the supporting-bracket, of the saw-wheel and hand in the presence of two Witnesses its shaft, boxes for the shaft, rods supporting the boxes, and aweighted lever I, comprising DEMPSEY B. HANSON. 5 two armsf and g for supporting ILhe rods, the

arm g, having knife-edges or fulerums h h and Vtnesses: i fi to engage; respectively, the bracket and ANATALO MENDES, rods. HERMAN L. BLANCHARD. 

